CVE-2026-101042 Parse Server 9.0.0 Authentication Bypass via Unverified Provider Identity
Attackers can bypass authentication checks to hijack accounts or spoof identities in Parse Server deployments using specific code-based auth adapters.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-101042?
CVE-2026-101042 is a high-severity authentication bypass vulnerability in parse-community parse-server, published on 27 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Parse Server is an open-source backend server. In versions >= 9.0.0 < 9.10.1-alpha.10 and >= 8.0.2 < 8.6.91, the code-based authentication adapters (GitHub, Google Play Games, Instagram, LINE, LinkedIn, Microsoft, QQ, Spotify, WeChat, Weibo) verify the client's authorization code with the external provider on signup and on provider linking, but not when authentication data is supplied together with a username and password on the login endpoint. As a result, a low-privileged authenticated user can attach an arbitrary, unverified provider identity to their own account without the provider ever being contacted, spoofing an external identity toward application logic that trusts the linked provider ID. An attacker can also pre-hijack accounts: by claiming the provider ID of a victim who has not yet linked that provider, the victim's later legitimate sign-in with that provider resolves to the attacker's account. Only deployments configuring one of the affected code-based auth adapters are impacted. Versions 9.10.1-alpha.10 and 8.6.91 fix the issue by running the adapter's credential verification on the login and challenge endpoints and rejecting a provider identity already linked to another user. As a workaround, disable the affected code-based auth adapters.
Weakness: CWE-287
Which versions are affected by CVE-2026-101042?
1 open source package ship an affected version, including parse.
| Package | Affected | Fixed in |
|---|---|---|
parse Bitnami | From 8.0.2 | 8.6.91, 9.10.1 |
How do I fix CVE-2026-101042?
Upgrade parse to a fixed version for your release line: 8.6.91 or 9.10.1.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-101042 being exploited?
There is no known exploitation of CVE-2026-101042 in the wild and no public exploit code.
Sources
Also known as BIT-parse-2026-101042, GHSA-3865-44r7-h828, GHSA-mr43-w6c2-mvjq.